New polarization techniques for the development of high-intensity
polarized H- and 3He++ ion sources will be reviewed.
We propose the quantum model of spinning black holes with the integrable ring singularities. For the modified Kerr-Newman quantum metric, the complete regularization occurs at fixation of the maximal (cut-off) energy of gravitons $k_{UV}^{reg}=\hbar c/ R_S^{reg}$.
The domains of existence of one, two and several events horizons $r_q$ are presented depending on parameters of the Kerr and...
Abstract.
The Spin Physics Detector is an experiment at NICA designed to study the spin structure of the proton and deuteron and the other spin-related phenomena using polarized beams.The collision energy is up to 27 GeV and the luminosity is up to 10^32 cm^โ2 s^โ1 in pp mode.
Two scintillator-based detectors, Beam-Beam Counters (BBC), will be installed upstream and downstream the...
At an experiment on acceleration of a polarized proton beam up to an energy at 13 GeV, the possibility of crossing the transition energy at 5.7 GeV by a jump is considered. The scheme of crossing by a rapid change of transition energy, assumes the longitudinal movement of the beam near the zero value of the slip coefficient. The jump itself is carried out in the absence of an RF field. The...
Besides offering a solution to the strong CP problem in QCD, axions are one of the prime candidates for dark matter. One of manifestation of the galatic axion halo of light "invisible" axions is generation of the oscillating electric dipole moment of nucleons and light nuclei, and the NMR like rotation of spins in the axion induced psedomagnetic field. For spins in storage rings the...
The dynamics of spin in external electromagnetic, gravitational, and axion fields is analysed in the framework of the gravitoelectromagnetism approach in Einstein's general relativity theory. We consistently extend the recent studies from the flat Minkowski geometry to the curved spacetime manifolds, contributing to the discussion of the possible new role of a precessing spin as an ``axion...
Manifestation of dark matter axions in spin experiments
A. J. Silenko
BLTP JINR, Dubna, Russia
The relativistic spin dynamics defined by the pseudoscalar field of dark matter axions is rigorously determined [1]. The relativistic Hamiltonian in the FoldyโWouthuysen representation is derived. The biggest term describes the extraordinary (three orders of magnitude) enhancement of the axion...
We examined versions of quantum electrodynamics (QED) with opposite signs of particle and antiparticle masses in Dirac equations and with empty fermion vacuum without states with negative energies. Application of S-matrix elements of QED versions under consideration leads to complete coincidence of the computational results of physical processes with the appropriate results in the standard...
It is known that in slow collisions of two bare nuclei with the total charge number larger than the critical value, Z_1+Z_2 > Z_c =173, the initially neutral vacuum can spontaneously decay into the charged vacuum and two positrons. Detection of the spontaneous emission of positrons would be the direct evidence of this fundamental phenomenon. However, the spontaneous positron emission is...
The relationship between the Weyl-gauge vector and the electromagnetic potential vector is considered.
The present work is part of a research devoted to the development of a method to search for particle EDMs in an existing storage ring. This method involves a flipping of the beam's polarization axis as part of its energy fitting sub-procedure (to realize the "Quasi-Frozen Spin" condition). Generally, the preservation of the polarization requires that spin-flipping be done adiabatically; but...
One of the possible arguments in favor of violation of CP invariance is the existence of nonzero electric dipole moments (EDM) of elementary particles. The idea of searching for the electric dipole moment of the proton and deuteron using polarized beams in the storage ring was originally based on the "frozen spin" method in 3D space and the creation of conditions under which the contribution...
The basic idea to search for the Electric Dipole Moment (EDM) of charged particles in a storage ring was first proposed by the BNL. It assumes observation of the vertical buildup of beam polarization caused by the EDM in a so-called Frozen Spin (FS) lattice. The latter is composed of electrostatic deflectors to keep the momentum of the beam aligned with the direction of a polarization vector....
$\mbox{CP}$-odd asymmetries in the processes $e^+e^-\rightarrow \tau^+\pi^-\nu_\tau$, $e^+e^-\rightarrow \pi^+\tau^-\bar\nu_ \tau$, $e^+e^-\rightarrow \tau^+\rho^-\nu_\tau$, $e^+e^-\rightarrow \rho^+\tau^-\bar\nu_\tau $, $e^+e^-\to \tau^+e^-\nu_\tau{\bar\nu}_e\,,\,$ and $\,e^+e^-\to \tau^-e^+\nu_e{\bar\nu}_\tau$ are investigated with account for longitudinal polarization of electron (or...
The scattering $R+T\to A+X$, where $A$ and $X$ are known sets of particles, is discussed. With known momenta of all participants, process is described by the scattering amplitude and cross section.
Real colliding particles exist in the form of wave packets --- superpositions of monochromatic states with some spread $\Delta p$. In many cases, the amplitude change in the $\Delta p$...
The production of the $\pi^0$ and $\eta$ mesons are studied adopting handbag approach with GPDs in electron-proton scattering in Electron-ions collider in China (EicC) energy ranges. GK model is used to study these reactions.The predictions indicate that transversity dominance $\sigma_T\gg \sigma_L$ observed at low energies is valid up to EicC energy range. The transversity GPDs can be...
The amplitude ratios of vector-meson production by heavy photons on spinless targets are shown to can be explicitly expressed in terms of the spin-density-matrix elements (SDMEs) only if the lepton beam is polarized. Making use of the amplitude ratios as free fit parameters instead of the SDMEs reduces the number of the real parameters in data description from 23 to 8. The exact formula for...
We revisit the spin polarization effects induced by thermal vorticity by calculating them directly from the spin-dependent distribution functions. For the spin-1/2 particles, we find that the spin polarization from the acceleration relative to the vorticity is suppressed compared to the result derived from the mean spin polarization vector. For the spin-1 particles, we give the spin...
We recall the notion of duality between theory of equilibrium of media and gravity, in the version introduced at JINR. As an application a dissipation-free axial current is evaluated.
Based on a general analysis of conservation laws, the duality between gravity and hydrodynamics of a relativistic quantum fluid in a flat space is shown. This duality is expressed in the equality between hydrodynamic transport coefficients and quantum corrections in curved space-time. It is shown that the gravitational chiral anomaly is dual to the axial current in the vortical and accelerated...
Using first-principle numerical lattice simulations of rotating quenched QCD, we demonstrate that the hot gluon plasma develops strong inhomogeneity with angular rotation. In certain conditions the existence of mixed confinement-deconfinement phase, when the periphery and central regions of rotating system are in the different phases, becomes possible. We study the spatial distribution of the...
Time dependencies of the correlations between the velocities of pions and nucleons, as well as between their vorticities are obtained in frames of PHSD model for Au+Au collision at $\sqrt{s_{NN}} = 7.8$ GeV and fixed impact parameter 7.5 fm. The difference in results for these two correlations is explained. It is shown, that the Hubble-like expansion of the fireball gives a significant...
The study of global polarization in heavy-ion collisions has revealed the presence of a vortical fluid with significant angular momentum and vorticity. This phenomenon can be observed through weak decays of particles such $\Lambda$ hyperons. Experimental data of $\Lambda$ global polarization from RHIC and LHC provided
opportunity to get new insights into the collective behavior and...
We study Z-boson production at the LHC energies within framework of the parton Reggeization approach of high-energy QCD [1,2]. Oppositely the previous calculation [3], based on LO approximation with the partonic process $Q+\bar Q \to Z$, we take into account NLO contribution from the partonic process $Q+R \to q+Z$, where $R$ is the Reggeized gluon and $Q$ is the Reggeized quark. The good...
The heavy quarkonium spin-physics is an important task of high energy physics which we study using charmonium production within the Nonrelativistic Quantum Chromodynamics (NRQCD) approach and Generalized Parton Model (GPM). We extracted a set of the NRQCD and GPM parameters by fitting data of charmonium production in proton--proton collisions measured by the PHENIX and NA3 collaborations, ...
The nonleptonic decay $\Xi^0_c \to \Lambda^+_c \pi^-$ with $\Delta C=0$
is systematically studied in the framework of the covariant confined quark
model (CCQM) with account for both short and long distance effects.
The short distance effects are induced by four topologies of external and
internal weak $W^\pm$ exchange, while long distance effects are saturated
by an inclusion of the...
We present the study of the multi-loop effective potential evolution in ฯ4-theory using the conformal symmetry. We demonstrate that the conformal symmetry can still be useful for the effective potential approach even at the presence of the mass parameter. To this goal, it is necessary to introduce the special treatment of the mass terms as sorts of interaction in an asymptotical expansion of...
The initiated by Carter (1969) electron model, based on the Kerr-Newman (KN) black hole solution, was recently modified to form a heavy electron model dressed by gravity. Similar to QED, gravitating electron can be considered as a bare or dressed model, where the bare electron represents a massless relativistic ring string creating wave function of quantum theory, while the dressed electron...
Nonlinear field model of extremal space-time film is considered as unified field model [1-6]. Its space-localized solutions representing the elementary particles are investigated. In particular, we consider the field configuration having a form of the twisted lightlike soliton moving along the ring of the toroidal coordinate system. The exact solutions in the form of twisted light-like...
The total cross section of scattering of vector polarized protons on tensor polarized deuterons provides a null-test signal of violation of invariance with respect to time reversal (T) while conserving spatial (P) parity [1]. Very similar is the double polarized $^3$He-d scattering considered here. The null-test signal cannot be simulated by the interaction in the initial and final...
The status of $z$-scaling theory is reviewed. Basic physical principles such as self-similarity, locality, and fractality are discussed. The microscopic scenario of interactions of hadrons and nuclei at a constituent level in terms of dimensionless variables is studied.
The structure of the colliding objects and fragmentation process in final state is described by fractal dimensions...
I study the neutrino scattering off a rotating black hole surrounded by a realistic magnetized accretion disk called a Polish doughnut. A neutrino is supposed to have a nonzero magnetic moment. I account for the contributions of the electroweak interaction of a neutrino with plasma of the disk and the interaction of the neutrino magnetic moment with magnetic fields in the disk on the neutrino...
The Standard Model (SM) is a theory of elementary particles and their interactions that has a good agreement with experimental high-energy-physics data. However, this model should be extended to a more general theory due to the some theoretical problems of the SM and experimental facts beyond the SM. Effective field theory (EFT) is a way that allows one to search for any deviations from the SM...
Heavy-ion collisions at center-of-mass nucleon collision energies 2.3--11.5 GeV are analyzed within the parton-hadron-string dynamics (PHSD) transport model. After the separation of spectator nucleons, the momentum distributions of particles constituting a fireball are fluidized and the energy and baryon number densities, temperature, and velocity fields are obtained in the Landau frame. It is...
The investigation of vortical structure of matter in heavy-ion collisions at the energies of a few GeV per nucleon is one of the goals of future MPD experiment at NICA. Within this work it is done by studying global polarization of $\Lambda$ hyperons within the framework of the MPD, in order to assess the performance of the detector with respect to these observables. The study is performed via...
SPASCHARM experiment started to study spin effects in hadron production. Data taking runs were carried out with polarized and nuclei targets. Curreny status of the experiment is presented.
Abstract. The concept design of the SPASCHARM experiment setup allows us to measure non-vanishing observables for direct reconstruction of the pp elastic scattering amplitudes at the energy of 16 GeV. We discuss experimental measurements required to extract all amplitudes for two types of polarized target and polarized proton beam.
Realistic simulation was carried out to estimate accuracy...
